'Darkness' in the Bible

I realized that wisdom has an advantage over folly, just as light has an advantage over darkness.

{The wise man can see where he is walking}, but the fool walks in darkness. Yet I also realized that both of them suffer the same fate.

Also, he eats in darkness all his days; he is frustrated [in] much sickness and resentment.

For he comes into vanity and departs into darkness, and his name is shrouded in darkness.

For if a man lives many years, let him rejoice in all of them! Let him remember that the days of the darkness will be many-- all that is coming [is] vanity!